Question

There are 24 students in a science class. Mr. Sato will give each pair of students 3 magnets. So far, Mr. Sato has given 9 pairs of students their 3 magnets. How many more magnets does Mr. Sato need so that each pair of students has exactly 3 magnets?

Answer 1

3x (x=students)
3(24)=72
He has given 9 students their magnets so 9(3)=27 
72-27=45 
He needs 45 more magnets